FR2609348B1 - FOCUSING ERROR DETECTION APPARATUS - Google Patents

FOCUSING ERROR DETECTION APPARATUS

Info

Publication number
FR2609348B1
FR2609348B1 FR8800113A FR8800113A FR2609348B1 FR 2609348 B1 FR2609348 B1 FR 2609348B1 FR 8800113 A FR8800113 A FR 8800113A FR 8800113 A FR8800113 A FR 8800113A FR 2609348 B1 FR2609348 B1 FR 2609348B1
Authority
FR
France
Prior art keywords
error detection
detection apparatus
focusing error
focusing
error
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
FR8800113A
Other languages
French (fr)
Other versions
FR2609348A1 (en
Inventor
Maeda Takanori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of FR2609348A1 publication Critical patent/FR2609348A1/en
Application granted granted Critical
Publication of FR2609348B1 publication Critical patent/FR2609348B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/133—Shape of individual detector elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Head (AREA)
FR8800113A 1987-01-07 1988-01-07 FOCUSING ERROR DETECTION APPARATUS Expired - Fee Related FR2609348B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62002160A JP2596545B2 (en) 1987-01-07 1987-01-07 Focus error detecting device and method for selecting light receiving area width of photodetector used therein

Publications (2)

Publication Number Publication Date
FR2609348A1 FR2609348A1 (en) 1988-07-08
FR2609348B1 true FR2609348B1 (en) 1994-02-11

Family

ID=11521603

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8800113A Expired - Fee Related FR2609348B1 (en) 1987-01-07 1988-01-07 FOCUSING ERROR DETECTION APPARATUS

Country Status (4)

Country Link
US (1) US4920527A (en)
JP (1) JP2596545B2 (en)
DE (1) DE3800255A1 (en)
FR (1) FR2609348B1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5126988A (en) * 1989-05-22 1992-06-30 Nhk Spring Co., Ltd. Optical head structure
CA2012401C (en) * 1989-05-26 1994-05-10 Anthony G. Dewey Focus-error detection using prism-enhanced spot size monitoring
JP2795528B2 (en) * 1990-07-25 1998-09-10 パイオニア株式会社 Signal detection device
US20050068864A1 (en) * 1999-07-08 2005-03-31 Samsung Electronics Co., Ltd. Method and apparatus for tracking error detection in optical disk driver
KR100750093B1 (en) * 2000-10-12 2007-08-21 삼성전자주식회사 Defocus error signal detecting apparatus and method used in optical pickup and seek direction detecting apparatus and method employing it
KR100354771B1 (en) * 2000-12-28 2002-10-05 삼성전자 주식회사 Optical pickup apparatus for capable of detecting thickness variation of recording medium and/or compensating spherical abberation generated by thickness variation thereof
KR100408284B1 (en) * 2001-05-19 2003-12-03 삼성전자주식회사 Method and apparatus for reproducing optical disk
CN1299274C (en) * 2002-10-02 2007-02-07 松下电器产业株式会社 Optical disk device

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54124705A (en) * 1978-03-20 1979-09-27 Teac Corp Optical reproducer
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
JPS59147306A (en) * 1983-02-10 1984-08-23 Sony Corp Focus error detector
JPS59221835A (en) * 1983-05-31 1984-12-13 Sony Corp Detector of focus error
JPS601632A (en) * 1983-06-18 1985-01-07 Mitsubishi Electric Corp Optical recording and reproducing device of information
JPS6055521A (en) * 1983-09-05 1985-03-30 Mitsubishi Electric Corp Automatic focus controller of optical disk
JPS6070924U (en) * 1983-10-19 1985-05-20 パイオニア株式会社 Focus error detection device
JPS60131648A (en) * 1983-12-19 1985-07-13 Toshiba Corp Optical head
JPS60185230A (en) * 1984-03-02 1985-09-20 Pioneer Electronic Corp Focal error detector
JPS60217534A (en) * 1984-04-11 1985-10-31 Mitsubishi Electric Corp Focus detector
US4724533A (en) * 1984-06-15 1988-02-09 Matsushita Electric Industrial Co., Ltd. Optical head
US4742218A (en) * 1985-03-11 1988-05-03 Hitachi, Ltd. Focus error detection apparatus utilizing focusing an front and rear sides of focal planes
EP0261545A1 (en) * 1986-09-17 1988-03-30 Siemens Aktiengesellschaft Detection device for determining focus error in an optical data storage apparatus
JPH0626972Y2 (en) * 1986-10-03 1994-07-20 パイオニア株式会社 Optical pickup device

Also Published As

Publication number Publication date
DE3800255C2 (en) 1990-06-28
FR2609348A1 (en) 1988-07-08
JPS63168842A (en) 1988-07-12
DE3800255A1 (en) 1988-08-04
JP2596545B2 (en) 1997-04-02
US4920527A (en) 1990-04-24

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Legal Events

Date Code Title Description
D6 Patent endorsed licences of rights
ST Notification of lapse